from module import Car, Truck

car1 = Car()

car1.driveForward()
car1.driveBackward()

car2 = Truck()

car2.unloadCargo()
car2.loadCargo()
car2.unloadCargo()

car3 = Truck()

car3.driveForward()
car3.driveBackward()
car3.loadCargo()
car3.unloadCargo()